Merge pull request #14 from avasquez614/master

AddSchemeAndDomainAndServerPortUrlTransformer can now be force to alw…
Merge pull request #15 from avasquez614/master

Upgraded dependencies to latest version.
Merge pull request #16 from avasquez614/master

Rearranged dependency.
Merge pull request #17 from avasquez614/master

Made HttpServletUtils.getAttribute() return generic
Merge pull request #21 from avasquez614/master

Fix for CRAFTERCMS-859.
Merge pull request #22 from avasquez614/master

Added response messages to cache REST services.
Merge pull request #23 from avasquez614/master

Added exists method to check if a file exists