Issue/6101 Make all interfaces/classes autoloadable

Limit blacklist to php files

During performance optimization I have discovered that the installer scans all files for the blacklisted words. This greatly impacts speed on lower end devices such as the raspberry pie. This commit limits it to PHP files which seems to achieve the desired effect. 

I have used the --include option to achieve this, see http://stackoverflow.com/questions/1987926/how-do-i-grep-recursively

This contribution is MIT licensed

Add Jail and PermissionsMask storage wrappers

Jenkins 12447

Introduce buildPath() in Storage\Local to reduce the difference to MappedLocal

Issue/12444 namespace exceptions

delete old previews

Cache results of available languages

Move constants from GET_TYPE to OC\Files so they can be autoloaded

This function is about 8 times calles for every single page call, when caching this variable I was able to gain a small performance improvement from 20,512 µs to 630 µs profiled with xhprof

Surely, this is no gigantic gain but if we would do that for every function out there...

added comment that App Store is disabled for EE

Use a more universal shebang

Don't show favicon to prevent iteration through subfolders

remove deprecated \OC:$session

The codepath for generating the favicons iterates through subnodes and if one of those nodes is unavailable is throwing a 503 exception. Since these favicons don't have any use except of "making a tool for developers looking nicer" I consider it feasible to remove them.

Migrate Google Drive external storage app to v1.0.6-beta of the google-api-php-client library

autoconfig.php only to be deleted on successful installation

Replace some more "command -v" calls with the Helper method

because OC_User::login will create a new session we shall only try to lo...

fix calculation of expiration date if there is a default expiration date...

because OC_User::login will create a new session we shall only try to login if user and pass are set

ensure to never destroy an existing session

Issue/6101 remove namespace permission constants