Making Travis happy

The Github-based CI server (Travis), tends to run out of resources quickly.
This commit adds a new optional flag that allows the build to skip tests that
are known to be resource intensive.
Example usage: ant -DskipResourceIntensiveTests=true clean test

This change also splits up build steps distinct Travis environments. This
helps to isolate resource usage, as well as speed things up (as things run
in parallel now)

Do not depend on platform-provided junit integration for Ant.

When executing junit, Openfire used to depend on the Ant/JUnit integration
as provided in the home directory of ant. This leads to platform-specific
build results. By providing the ant/junit libraries, this effect is reduced.

Denote Openfire 4.0.0 Beta

Reflected XSS Issues in Admin Console

OF-1003 OF-1002 Make XEP-0198 thread safer

Don't let ServerDialback ask for stream:features

ofmeet plugin version 0.3.1

updated plugin date

Fixed issue with broken presence broadcast
Fixed issue with broken desktop/screen sharing
Fixed issue with missing jnsctp.dll dependencies
Removed some more redundant or duplicate jar files in jitsivideobridge lib

OF-973: TLS negotiation failures should come in two flavors.

DefaultUserProvider: Rethrow exception instead of silently logging it.

OF-997 Deny framing to avoid clickjacking

The reason is, that when calling the createUser() method, the caller thinks user creation succeeded, even if it might not.
This leads to unexpected behavior.

I've experienced that, when trying to create a user with a name of > 100 length:

com.mysql.jdbc.MysqlDataTruncation: Data truncation: Data too long for column 'name' at row 1
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4230)
	at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)
	at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)
	at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
	at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1307)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.logicalcobwebs.proxool.ProxyStatement.invoke(ProxyStatement.java:100)
	at org.logicalcobwebs.proxool.ProxyStatement.intercept(ProxyStatement.java:57)
	at com.mysql.jdbc.Statement$$EnhancerByProxool$$cb3cdf02.execute(<generated>)
	at org.jivesoftware.openfire.user.DefaultUserProvider.createUser(DefaultUserProvider.java:164)

OF-1001 Drop Clearspace support

OF-928 Add a copy of the extendedInformation

Upgrading the Ant Contrib & XmlTask libraries

Admin Console: External Component Settings

The page on which a user can manage the settings for External Components should offer
all features that are available now that the new ConnectionManager has been implemented.

OF-995: Parent plugin identification should not be case-sensitive.

Avoid nested EL delimiters

Nothing should be transmitted when STARTTLS negotiation fails, not even
a stream close.

When STARTTLS fails, there are two distinct types of failure. Each type should
be handled in a distinct manner.

Note that this commit applies a fix to the S2S code only. C2S may also need work.

Possibly a copy/paste glitch from an earlier refactoring exercise.