Adds some tests for cache classes.
Make exists public.
Fix some code standard issues in tests.
Adds a File test.
Enabling apc, redis in travis.
Adding memcached, redis & apc services.
Fixing apc extension loading for php 5.5
Adds test for clear & exists method of Cache.
Remove unused bootstrap.php file.
Corrects type of assertion used in tests.
Adds php5.6 and enables apc extension for same.
Merge pull request #10 from Achal-Aggarwal/enabling-ext

Adds some tests and enables apc, redis services at travis for testing.