Add NSDate.dateFromISO8601String helper method

Adapted from soffes/sstoolkit:
https://github.com/soffes/sstoolkit/blob/master/SSToolkit/NSDate%2BSSToolkitAdditions.m

Added support for ignoring milliseconds.
Support ISO8601 server times

Add support for ISO8601 server times as defined by the server-time CAP
spec: http://ircv3.atheme.org/extensions/server-time-3.2

Attempt to maintain backwards compatibility with old server-time formats
supported in various ZNC releases (including @t and @time keys, and
ISO8601 and unix timestamp values).

Send both the old znc.in/server-time and znc.in/server-time-iso
capabilities since we now support both formats.
Merge pull request #169 from blt04/server-time-iso

Support ISO8601 server times
Work around for a crashing bug in WebKit for Mountain Lion and Lion
Released 2.36
Add more unicode space(0x1680).
Add more unicode combining block(U+FE20 - U+FE2F).
Add more unicode combining block again.
Merge pull request #176 from hanabokuro/add_more_unicode_space

Add more unicode space(0x1680).
Merge Unicode block changes.
Update code point ranges for WebKit crash work around
removing sign keys
fixing rake install
adding modified version label
only hear USER_NOTIFICATION_CHANNEL_MSG from #mongoid channel