Be sure the 'sys' module is loaded
Add support for files that don't have a single root node
Add support for adding other filename patterns for tag highlighting.

Use `g:breeze_highlight_filename_patterns` to set the filename patterns
to highlight.
Merge branch 'add-highlight-support-for-other-filetypes' of https://github.com/someboddy/breeze.vim into someboddy-add-highlight-support-for-other-filetypes
Merge branch 'support-files-without-single-root-node' of https://github.com/someboddy/breeze.vim into someboddy-support-files-without-single-root-node
Minor refactorings
Fixes #3
Fix typos in README.md
Fix #5
Use alphabetical order for jump marks (#6)
Update changelog
Update README.md
Major refactoring
Update CHANGELOG.md
Update docs
Remove redundant code
Restore option "breeze_highlight_filename_patterns" for backward compatibility
Rename option "breeze_hl_element" to "breeze_highlight_curr_element"
Update CHANGELOG.md
Update breeze.txt