[#1549880] Cleaning up comments some.

[#1624970] fix issue with wrong constant on status report
[#1645910] adding support for composer

cache clear functionality.

XSS error

public:// not file_default_scheme().
Issue #1398498 by corey.aufang, marcvangend, attiks: Display lessphp
version number on drupal status report.
Issue #753714 by corey.aufang, cweagans: unbundled lessphp library from
module.
Issue #1347258 by corey.aufang, chx, Jeremy: Changed method for less
file regeneration to avoid race condition.
Issue #1421044 by corey.aufang, pillarsdotnet: Created .install file and
moved appropriate functions to it from .module.

by corey.aufang: Final fix for race condition. Add in change that preserves key in styles array; only change the file path.

in D7.