Support `<!--` comment syntax

https://code.google.com/p/esprima/issues/detail?id=451
Fix wrong handling of relational expression in a for statement.

If operator 'in' is not allowed, it can not be just allowed within
the binary expression.

https://code.google.com/p/esprima/issues/detail?id=449
Accept Ogham Space Mark as whitespace character

https://code.google.com/p/esprima/issues/detail?id=452
Add whitespace tests for line terminator characters

https://code.google.com/p/esprima/issues/detail?id=452
Attach every comment to the possible following syntax node.

The comment is placed in the leadingComments array of the said node.
This is based on the original patch from Yusuke Suzuki.

https://code.google.com/p/esprima/issues/detail?id=197