fixed Array.prototype.indexOf polyfill
use lib.indexOf instead of Array.prototype.indexOf
Fix undefined variables throwing exception with length filter
Add support for 'in' test.
fix using `include` and a few other forms within macros (fixes #159)
relax parseTemplateRef and allow any arbitrary expression (fixes #269)
Merge pull request #248 from garygreen/fix/length-undefined

Fix undefined variables throwing exception with length filter
also relax `import` to take an expression
clarify `env.addGlobal` method
prep for 1.0.6
fix versioning in browserfiles, bump to 1.0.7
Merge remote-tracking branch 'origin/master'
rebuild browserfiles
add test coverage using istanbul
fixed urlize period removal
fixed urlize period removal
fixed urlize period removal
Fix #235 - custom start/end symbols were global to all environments.
Fix issue described at http://stackoverflow.com/questions/21777058/loop-index-in-included-nunjucks-file
Merge pull request #280 from amyboyd/stackoverflow-21777058

Fix issue described at http://stackoverflow.com/questions/21777058/loop-index-in-included-nunjucks-file