prateek/pidgin

Add support for the author-name-color property to PidginMessage and wire it up in PurpleMessage as well

Testing Done:
Joined a chat and verified names were colored properly as well as in im's.

Reviewed at https://reviews.imfreedom.org/r/744/
libpurple/data/purple-url-handler.desktop.in
libpurple/protocols/null/nullprpl.c
pidgin/data/im.pidgin.Pidgin.desktop.in
sub/libpurple/data/purple-url-handler.desktop.in
sub/libpurple/protocols/null/nullprpl.c
sub/pidgin/data/im.pidgin.Pidgin.desktop.in