In This commit we extend the work being done by @showell in PR#1778
to develop a tool to pretty print html and our handlebar templates
in order to enforce our style convention of 4 Space indentation in
templates.
This commit introduces following changes:
* Fix Py3 Compatibility.
* Add ability to prettify in cases when html tags are not the
starting of a line and addition of test cases for it.
* Add ability to lint handlebar tags and add test cases for it.
* Add {{else}} as special case of indent.
* Add test cases in general to testing new tool.
@showell Helped me throughout and reviewed this commit.
Fixes#1778
adnrs96