Ircpdb

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- Switched to Gist instead of Dpaste.
- Added functionality allowing one to specify their own Paste backend.

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- Added 'activation_timeout' timer that defines a time limit for the first
interaction with the IRC channel before disconnecting and continuing
execution.

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- Adds a django template tag {% set_trace %}; this is usable for opening
up an ircpdb channel during template parsing.

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- Adds functionality for specifying configuration parameters via a single
argument containing a URI. Rather than specifying potentially a dozen
separate parameters, one can now provide a single string; for example:
"irc+ssl://botchat.freenode.net:6667/mychannel?limit_access_to=me".
- Adds ability to specify default configuration parameters via environment
variable named 'DEFAULT_IRCPDB_URI'.

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- Simpler internal handling of prompt.
- Adding internal support for IRC CTCP commands.
- Pinning jaraco/irc library version at 0.9 to preserve Python 2.6 support.

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- Reduced security concerns by making it impossible to configure the
debugger to respond to all usernames.
- Fixed a UI glitch in which the prompt would be displayed in inappropriate
situations.