Add a filter to TimberPostGetter::get_posts

Makes it easier to add support for plugins that like to mess with the loop (eg. BuddyPress). 

This way you can add support for popular plugins by writing small plugins/extensions like this:
https://github.com/slimndap/TimberBuddyPress

No need to add any hacky code to you theme anymore!
Merge branch 'patch-1' of github.com:slimndap/timber into slimndap-patch-1

* 'patch-1' of github.com:slimndap/timber:
  Add a filter to TimberPostGetter::get_posts
tweaked filter name and gave one to get_post as well
updated composer to handle travis error
some updates to the read me
added admin_email to TimberSite
added TimberMenu.title
allow a TimberUser object to be initialized through a WP_User object
add new filters for Timber Debug Bar and ability to get calling script _file_
fix minor typos in theme template commments
Merge pull request #295 from andyford/typo-fix

fix minor typos in theme template commments
Use admin_url() in 'Timber not activated' message in case WP installed at custom path
removed duplicate method logic from TimberUser; fixed field order for act filter
Update timber-helper.php

My Timber-generated pages were failing HTML validation due to some improperly closed standalone tags. This changes those tags to the correct formatting. I left the close slash for backward compatibility with XHTML. There may be other tags, but these were the ones that quickly came to mind.
allow TimberUser to accept initialization based on array
Merge branch 'admin-notices' of github.com:andyford/timber into andyford-admin-notices

* 'admin-notices' of github.com:andyford/timber:
  Use admin_url() in 'Timber not activated' message in case WP installed at custom path
placing path inside of admin_url() function
Merge branch 'andyford-admin-notices'

* andyford-admin-notices:
  placing path inside of admin_url() function
  Use admin_url() in 'Timber not activated' message in case WP installed at custom path
added __toString method for TimberPost
fixed error in case length of items in array is greater than default query size