Dev/improvements

[MessuKilkain]

• Fix folding by not folding filtered lines
• Add setting to fold at the end of the line or between lines

I was trying to use the package for my Objective-C log, expected to get something as useful as the filter provided by AndroidStudio for Android logs. I got several issues to get what I wanted. First I wanted to fix the behaviour of folding to fit what I expected (and I guess should be).

I'm also currently working on other improvements to fit my requirements (option to display multi-lines log entry after, option to display some lines before and after the filtered lines).

[MessuKilkain]

Since this branch has a failed the travis build, and I did some other improvements, I close this request and let the new other one open.