improve source code for easy reading

improve source code for easy reading.
change post link from front view to edit.
move get and list data to model.
rewrite source code

improve source code for easy reading.
shorten insert sql command.
remove un-necessary variables.
rewrite source code

improve source code for easy reading.
shorten insert/update.
remove unwanted variables.
rewrite code about db

add custom active record.
add like_group() to generate like in group eg. (field1 LIKE keyword OR
field2 LIKE keyword)
Merge pull request #3 from vee-bizidea/master

pull request pls