base header parser
working on #12
HeaderTree as class. added more helper methods
more on #14. implemented basic header navigation. it's buggy and keybinding sucks
simpler keybinding
Working header navigation
hack to catch a header not overlined in the beginning of the file
code makeup. pep8, tiny DRY refactor, simpler regex, better paramenter name. etc
keybinding for win and mac
extra validation of headers to ignore +----+ table row separations
doc the new feature
when jump backward (PREV), if the cursor isn't exactly in a header,  jump to the header that containt the cursor position first, instead to a previous neighbor
Merge branch 'header_navigation'. This fix #12