Squashed 'subtree/quarks/' changes from 83ba770..0dbd256

0dbd256 Added enumerate folders method to folder class
6e6925b Streams moved to IO namespace
c176e13 Added few enum extensions
6f2839a Convert to array on enumerable made public

git-subtree-dir: subtree/quarks
git-subtree-split: 0dbd2567fd146b747a42ff031a1c7741cfcb27da
Merge commit '63f138dd2c71c3a0dd790788916b7004125997bf'
Removed redundant reference to stream extensions