Upgrade Pegdown to version 1.1.0

Version 1.1.0 (2011-10-05)
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- Upgraded to parboiled 1.0.2
- Introduced LinkRenderer layer for easy customization of HTML link rendering
- Added support for [[Wiki-style]] links, thx to Brett Porter
- Fixed #27 (Missing emphasis when paragraph has multiple lines)
- Fixed #28 (Parser not fully extensible)
- Fixed #32, #33 (HTML tags with attribute names containing underscores are not recognized as tags, thx to Edward Samson)
- Fixed #34 (Pathologically slow parsing when strong and italics emphasis are applied together)

Version 1.0.2 (2011-09-30)
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Core:
- Fixed #32 (ReportingParseRunner assumes only one parse error)
Java:
- Added 'NoneOf' rule constructor
- Updated Java parser example
- Fixed #22 (problem with parse tree creation for skipNode() matchers)
- Fixed #24 (IllegalStateException in certain cases involving parser inheritance)
- Fixed #30 (problem in action class naming resulting in NoSuchFieldError in certain cases)
- Fixed #31 (incorrect handling of 'switch' statements in rule method extension)
Scala:
- Upgraded to Scala 2.9.1
- Fixed #29 (nTimes(1, "a") will throw ClassCastException)