fixed manual folding
Merge pull request #103 from mtth/nofolding

Merged pull request #103, fix manual folding
honor changes to g:LatexBox_latexmk_async

Previously setting g:LatexBox_latexmk_async=1 after the plugin was loaded with
g:LatexBox_latexmk_async=0 would result in errors.
Some minor restructuring and clean up

* I prefer lines not to be longer than 80 columns
* In LatexBox_Latexmk: minor restructuring to remove some redundancy
More restructuring: removed redundancy
In LatexBox_Latexmk

Removed much of the redundancy between the cases for
g:Latexbox_latexmk_async.  In particular, the latexmk command should
be the same command in both cases.

The update also include some simple clean up and code improvements.
Escape '%' in async mode

Solves #95
Update doc to reflect escaping of LatexBox_latexmk_options
Merge pull request #104 from michamos/patch-1

Update doc to reflect escaping of LatexBox_latexmk_options