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Making highlight_phrase() to be UTF-8 compatible on demand.
Merge pull request #2948 from ivantcholakov/develop

Making highlight_phrase() to be UTF-8 compatible on demand.
Merge pull request #2947 from irfanevrens/patch-2

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[ci skip] Clear some whitespace
Fix DB forge unsigned attribute (PR #2949)
xss_clean() improvement

Fixes this: https://github.com/EllisLab/CodeIgniter/issues/2667#issuecomment-37819186
Another xss_clean() improvement

Fixes this: https://github.com/EllisLab/CodeIgniter/issues/2667#issuecomment-37958136
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