Better method for getting Output cache file embedded timestamp

Faster, shorter code
Merge pull request #1806 from vlakoff/develop-2

Better method for getting Output cache file embedded timestamp
redirect() documentation: add a note for IIS users
Changelog: add entry for the change in "auto" method of redirect()
Merge pull request #1783 from vlakoff/develop

Better server test in redirect() of URL helper
Ignore composer vendor directory

Signed-off-by: Alex Bilbie <alex@alexbilbie.com>
Merge branch 'develop' of github.com:EllisLab/CodeIgniter into codeigniter/develop
Added a contributing file to appear in pull requests and issues

https://github.com/blog/1184-contributing-guidelines
Signed-off-by: Alex Bilbie <alex@alexbilbie.com>
Changed the contributing file to a markdown document as Github doesn't support rendering contributing file as rst

Signed-off-by: Alex Bilbie <alex@alexbilbie.com>
Fixes issue #1815 - input::ip_address() returns incorrect IP behind proxy
Merge pull request #1816 from progmedia/develop

Fixes issue #1815 - input::ip_address() returns incorrect IP behind prox...
Fixed pagination document error.

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Fixed #1817 Pagination class error

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>
Merge pull request #1819 from appleboy/document

Fixed pagination document error.
Merge pull request #1820 from appleboy/pagination

Fixed #1817 Pagination class error
Update user_guide_src/source/libraries/loader.rst

Remove the second parameter
Merge pull request #1821 from Kristories/patch-1

Update user_guide_src/source/libraries/loader.rst
made some corrections to the code
corrected a few more style problems
Added 'binary/octet-stream' as PDF mime. Fixes #1840 and #1828

Signed-off-by: Alex Bilbie <alex@alexbilbie.com>