Added escapeHtml() to redirect

Added escapeHtml() to the redirect parameter to prevent potential cross-site scripting.
Fixed XSS leak in register form
Merge pull request #237 from RickKuipers/patch-1

[XSS] Added escapeHtml() to redirect
Update composer.json
Added ZF2 repository to composer.
Removed repository from composer.json (subtree split so no longer required).
Composer updates.
Merge pull request #267 from spiffyjr/master

Updated composer to use specific components.