Improvement and enhancement

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

Minor improvement

1. Bug fix.
2. Minor improvement.

Use use-package

Use use-package to organize configuration files and speed up loading significantly.
Able to customize.
e.g. company or auto-complete, ivy, helm or ido, etc.
Default: company and ivy.

Legacy loading, with helm

v1.0

Minor fix eshell.