chore(composer): use composer's psr-4 autoloading support
chore(composer): provide an explicit version number
chore(composer): Don't commit composer deps to the repo
chore(composer): reverting to psr-0 style autoloading
fix(elgg.xml): point to updated location of rules
chore(composer): update version info
Revert "Delete DisallowSpaceIndentSniff.php"

This reverts commit 253a29bd13b48fcf0f0696555ac433270d5dc2bb.
Revert "Delete ScopeIndentSniff.php"

This reverts commit c959d93cebb60ee4e3e7aaa3b12972a4f9f0219d.