Travis CI: Fix for Node.js 0.8.

As pointed out and prepared by Mathias Bynens.

https://code.google.com/p/esprima/issues/detail?id=317
Update to Unicode v7.0.0.

https://code.google.com/p/esprima/issues/detail?id=110
Issue 560: LeftHandSideExpression in ForInStatement not parsing when it contains an `in` operator

https://code.google.com/p/esprima/issues/detail?id=560
fix failing Travis build due to 0.10 representing 0.1 in YAML

See https://github.com/ariya/esprima/pull/274#issuecomment-50630052

https://code.google.com/p/esprima/issues/detail?id=317
Support future regular expression flags

https://code.google.com/p/esprima/issues/detail?id=557