Travis to run benchmarks on HHVM/1000

Running benchmarks for a 1000 page load takes about 8 min to complete on Zend
therefore using HHVM which just takes about 3 min.
Add some test fixtures
Merge pull request #530 from SemanticMediaWiki/fixture

Add some test fixtures
Fix 520
Merge pull request #522 from SemanticMediaWiki/travis

Travis to run benchmarks on HHVM/1000
Merge pull request #531 from SemanticMediaWiki/fix-520

Fix #520
Update RELEASE-NOTES.md

[skip ci]
Improve Special:Browse / Add UrlEncoder
Merge pull request #532 from SemanticMediaWiki/encoder

Improve Special:Browse / Add UrlEncoder
Update RELEASE-NOTES.md

[skip ci]
Add value hash to eliminate duplicates in query display
Merge pull request #534 from SemanticMediaWiki/value-fingerprint-hash

Add value hash to eliminate duplicates in query display
Update RELEASE-NOTES.md

[skip ci]
Merge branch 'master' of ssh://wmfgerrit/mediawiki/extensions/SemanticMediaWiki