[WIP] Initial SDK integration and Login support

[LAYOUT][V2] Fix bug on login authentication screen and improve code.

[PROJECT][V2] Update dependencies

[WIP][LAYOUT][V2] Add spotlight to chat list screen.

[PROJECT][V2]Remove author tag on doc comments

Merge branch 'develop-2.x' of github.com:RocketChat/Rocket.Chat.Android into project/remove-author-tag-on-doc-comments

[LAYOUT][V2]Chat list screen.

Add fontFamily to avoid diferences between editText with inputType=TextPassword and other inputType values.

From the doc: "By default, when you set an EditText element to use the "textPassword" input type, the font family is set to monospace, so you should change its font family to "sans-serif" so that both text fields use a matching font style".
Source: https://developer.android.com/guide/topics/ui/dialogs.html

Merge branch 'develop-2.x' of github.com:RocketChat/Rocket.Chat.Android into layout/chat-list-screen

[PROJECT][V2]Add Fresco library.