added the mode and control for program group
added the support for show program_group
change to using Polymorphic Associations for tv_program in user checkin
for the checkin tv program and program group
added the support for watch program group
fixed the bug, and added the support for watch program/group
added support for committing tv_program and program_group
change crawler for program group
fixed the bug for crawl program group
added the program group index page
added the count in program group index view
captured the exception
changed search word in baike from name to keyword
change to remove () for group name, and added the exception print