v0.8.0: New topics for HTML & FO

HTML:

• New section about controlling the chunking process (issue #38)
• New section: about <?dbhtml?> PI (issue #40)

FO/PDF:

• New section: Inserting Graphics on Title Pages (#36, #37)

Bug fixes:

• Correct canonical DocBook XSL URI (issue #27)
• Fix old link from code.google.com (issue #26)
• Add missing files in oXygen .xpr file (commit 948c127)
• Correct version number in dbsaxon script (replace hg log with git describe (commit ee60c00)
• Preserve some titles in html2cleanup.xsl (commit 2cbb20d)

Other changes:

• Correct index.html, use GitHub logo instead of Bitbucket (commit e7ff831)
• Remove section about Piwik (commit d59b667)
• Update list of contributors (commit 1d2c90e)

Thanks to Peter Schmelzer for helping with some issues!