add verdor path, add pattern files.
change template models, admin, form
change form of tempate. change template files about template.
change forms.py replace input class, and more modify.
change template.add_1.js,html,css.
add tags.py.
a snap commit
a snap commit
small modify
adding remove and find cell/corner methods
too many change. change template models,forms,views.
Merge remote-tracking branch 'origin/issue1' into issue1

Conflicts:
	codes/verdor/pattern.py
small modify.
change forms.py, small modify in models.py, modify template.add_2.js,html
change the style.
Two changes:

1. use a tagging file 'checked.txt' to mark if all the cell and background
   images have been validated

2. adding facility to add and remove image element into the pattern repo
change template.add_2.js,and html.
Merge remote-tracking branch 'origin/issue1' into issue1
modified verdor/pattern.py
a error repair
small modified.
too many modified, html, js, css.