Removed code duplication of xExists functions
Updated valueExists to utilize universal selector `id`
Merge pull request #61 from snewman205/butterflyknife

Removed code duplication of xExists functions
Fixed password hashing issue

Pushing toward standardized password hashing API.  Separate functions
for hashing vs verifying passwords.
Added installer check for required version of PHP
Merge pull request #11 from alexweissman/master

changes