Closes #857

Add alignWithWord option to be able to turn that off.

Some sites set them to auto, which messes up our cursor (and probably more)

And ensure we don't set cursor height to something negative.

Closes #864

There are cases when widget could be a different repsentation of code, so while folding the code 
one may want to show widgets for hidden lines.

I added showWidgets parameter to foldLines, if set it allows widgets for hidden lines to be shown.
Here is a simple showcase where this functionality is needed:
http://uxcandy.com/~boomyjee/dayside/plugins/teapot-copy/

To turn off the behavior where it'll always complete when only
a single option is left.

Closes #868

I tend to have some variety of it sitting in the root dir.

- Add options to Markdown mode to make it easier to extend
- Add GFM text overlay
  - SHA, User@SHA, and User/Project@SHA
  - #Num, User/#Num, and User/Project#Num
  - Vanilla URLs
- Add GFM-specific tests
- Fix overlay code so blankLine() is called
- Fix GFM for v3

- Inline links (square brackets followed by parentheses) cannot be separated by space (per Documentation and Dingus).

- Added test that checks both for this and correct highlighting of square brackets by themselves.

Also avoid a global variable that snuck through.

To make it easier for themes to override it.

Fixes ambiance

Closes #855

This'll align them with the previous line. It's not a perfect solution,
but probably better than simply returning 0.

Issue #854

fix reverse Regexp match which cause memory leak

Closes #844

Closes #843

Closes #853