added a TOC-like list of labels
Implement folding for specific environments only

User may select specific environments to be folded even if g:LatexBox_fold_envs
is set to 0. The environments are defined in g:LatexBox_fold_env_force list.
Default is empty.
Merge pull request #161 from ivlis/feature_force_env_fold

Implement folding for specific environments only
Merge branch 'master' of git://github.com/LaTeX-Box-Team/LaTeX-Box
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