Working on feature #4: added PelicanPluginTools.parse_makefile()
Add option "use_input_folder_in_makefile" and updated PelicanPluginTools.isPelicanArticle() for feature #4

Fixed indent
Updated description for feature #4 in Pelican.sublime-settings and README.md
Update PelicanPluginTools.isPelicanArticle() for feature #4
Merge pull request #5 from jsliang/feature_4

Finishs feature #4. Closes #4.