[#73270912]add 'tables' component
[#73270912]add forms 'component' into 'components.html'

add 4 patterns:
- Basic Example
- Inline Form
- Horizontal Form
- Form with categories
fix conflict in merge with 73270908tables
fix scsslint errors in '_forms.scss', 'docs.scss'
tweak styles in 'inline form'
update code sample of 'inline form'
update _fomrs.scss, _variable.scss

replace some values with sass variables
- $input-border
- $font-bold

export some values into sass variables
- $input-file-font-size
-
fix conflict in merge with master
- docs.scss
remove comment-line in _forms.scss
Merge pull request #18 from gengo/73270912forms

[#73270912] forms
Travis build 120