removed parameter from url_encode filter

the filter now only uses the more appropriate rawurlencode() which is also more consistent with the escape('url') filter
fixed url_encode when raw is false and URL is an array
feature #1390 fixed url_encode when raw is false and URL is an array (Tobion, fabpot)

This PR was merged into the 1.16-dev branch.

Discussion
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fixed url_encode when raw is false and URL is an array

alternative for #1388

Commits
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1930600 fixed url_encode when raw is false and URL is an array
49ba6b4 removed parameter from url_encode filter