Added heredoc support
VersionEye uses flat-squared, satisifies OCD
All keywords fully accounted for
Added support for double quoted heredoc

For some reason, quoted string matching seems not to work correctly.
I left one of the tests commented out so we'll go back to it once we've
got proper test suite for quoted strings.
Added nowdoc support
Merge pull request #14 from HippoPHP/order-keywords

All keywords fully accounted for
instanceof is an operator
All operators should now be accounted for
Added some missing ops. Removed some and sorted by greediness.
Ordered !== op
Sorting more ops
Sorted artihmetic ops by length
Merge pull request #12 from HippoPHP/missing-operators

Missing operators
Merge pull request #10 from HippoPHP/heredoc

Added heredoc support
Merge pull request #13 from HippoPHP/badge-square

VersionEye uses flat-squared, satisifies OCD
Added TOKEN_TYPECAST. Closes #7.
Fix broken tests due to missing parens