Fix for Android

#45 Crash by java.util.regex.PatternSyntaxException

Some fixes

• #43 Safe HTML processor gets stuck or runs very slow
• #44 URLs with dashes not recognised as valid.

Textile and Markdown

• Full support of Textile TxStyle.
• Partial support of Markdown Markdown Syntax.
• New tags for URL and Email — <url/>, <email/>.
• The conditional tag <if name="...">...</if> in templates.
• Logging. It supports logging by slf4j now.

New line tags

• New tags for new line, line end and blank line — <bol/>, <eol/>, <blankline/>.
• Ghost elements in pattern. You can mark an element as ghost and offset will not be changed after the element is parsed.
• Variable actions — rewrite by default, append, check.
• You can set a few patterns in a code.

Production

• Package name was changed to org.kefirsf.bb.
• Add a feature ignore case in patterns.
• Performance improvement.
• Add a control of nesting tags to prevent a java.lang.StackOverflowError.
• Add a configuration for HTML filtration.