update name of ModifierCollection
Merge pull request #63 from cordoval/patch-1

update name of ModifierCollection
Minor change in the description
minors
move to PSR4
Merge pull request #67 from cordoval/minor-fix

minor fix
move files
move again
actually it works like a charm
Merge pull request #70 from cordoval/move-to-psr4

move to psr4
plug minor fixes
Merge pull request #72 from cordoval/minor-fixes-again

plug minor fixes
Make sure logicX takes an expression
Minor fixes, PSR2 and docs.