Improvement and enhancement
- Add/enhance a several programming modes: golang, gitflow, imenu-list, etc.
- Folding: hideshow, viminish-fold.
- Enhance ivy: add ivy-rich.
- Use electric-pair instead of smartparens due to performance issue.
- Enhance eshell, info, desktop, bookmark, dried.
- Support pinyin in avy.
- Remove dashboard.
- Enable travis-ci.