remove date error if scope value has changed and value is valided

v2.3.9 without UTC timezone to calculate today

Reset dateFormater when dateformat change

chore(release): cut the 2.3.5 release

chore(bower): exclude tasks folder

chore(release): cut the 2.3.3 release

chore(release): cut the 2.3.2 release

chore(release): cut the 2.3.1 release

chore(release): cut the 2.3.0 release

chore(release): cut the v2.2.4 release