Implement FtpsiteAgent.

This agent checks a FTP site and creates Events based on newly uploaded
files in a directory.
Add :force_encoding support to WebsiteAgent.
Add :xpath support to WebsiteAgent.
Merge pull request #213 from knu/website_agent-xpath

Add :xpath support to WebsiteAgent.
Add regexp matching support to EventFormattingAgent.

A new setting key `matchers` is added to define regular expression
matching against contents of events and expand the match data for use
in `instructions` setting.
Rename FtpsiteAgent#transaction to saving_entries to avoid name conflict.
Ignore force_encoding if empty.
Merge pull request #210 from knu/ftpsite_agent

Implement FtpsiteAgent.
Recapitalising GitHub

As it's stylised as such everywhere.
Merge pull request #216 from dougaitken/patch-1

Recapitalising GitHub
ensuring the tmp folder is created in the source tree
Merge pull request #217 from pungoyal/bug/delayed_job_wont_start

ensuring the tmp folder is created in the source tree
Merge pull request #212 from knu/website_agent-force_encoding

Add :force_encoding support to WebsiteAgent.
Add specs for :matchers validation.
Adjust the style to the project's taste after a review.
Add a missing assertion.
Merge pull request #214 from knu/event_formatting_agent-regexp

Add regexp matching support to EventFormattingAgent.
Extract private development information to the wiki
make validate methods as an private method for avoiding to use it as an instance methods
Git +EOL