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
Fix memory leak
disturbing ctcp requests are disturbing
No code-signing for me