Added a function to disconnect from mysql server

Add "hidden" columns/fields into dbObject

liberate username and password variables for dbobject use

fixed delete statement return value

Added guard check at the beginning of the method, removed name === 'hidden' (that was useless).

Fixed byId and provide pagination with data type

- Fixed using byId error in active record pattern
- Provide pagination with data type (object, array, json)

new 2.7 release

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Update readme.md exectution typo

fix html syntax error

ensures php5.3 compatible array syntax

insertMulti implementation by using transactions

- MysqliDb::insertMulti() requires at least a table-name and
two-dimensional array containing the data-sets
- the third parameter $dataKeys can contain an array, setting|overriding
the table column names in the data-sets
- removes some unnecessary linebreaks and comments
- fixes typo
- adds insertMulti() to Readme
- adds MysqliDB::insertMulti() insertion tests
- removes whitespace changes

Adding error number to exception

More exception gets mysql error number with the second parameter:
connect()
queryUnprepared()
lock()
unlock()

Adding mysqli error number to exception in _prepareQuery method

Syncing joshcam master

Added methods for importing data (CSV, XML) and table locking

Add joinWhere, joinOrWhere