iOS : Add isFile and isDirectory support

Jira Tickets TIMOB-12414 and TIMOB-2181
Updated File documentation per Arthur
[TIMOB-12470] Added support for a node_appc_branch option that forces node-appc to install from git for a specific branch.
Merge pull request #3815 from cb1kenobi/timob-12470

[TIMOB-12470] Added support for a node_appc_branch option that forces no...
Merge pull request #3800 from benbahrenburg/master

iOS : Add isFile and isDirectory support
[TIMOB-10539] Fixed layouts in scrollview
timob-11408: don't need to specify the global object for modules since we don't create a new context for modules due to timob-11752
Merge pull request #3817 from bryan-m-hughes/timob-10539

[TIMOB-10539] Fixed layouts in scrollview
Merge pull request #3818 from pingwang2011/timob-11408

timob-11408: Android: Runtime error is thrown for require method when called from window opened via URL