updated gitignore with example html/css
commented css, credits to Gradle and CodeNarc
added trivial utility class to convert filenames containing "bad" link chars to uncritical strings
corrected link in report table

Table with overview of all files now contains proper links to the appropriate details sections
corrected typo in summary line (blank was missing)
Merge branch 'master' into FileCollection

* master:
  commented css, credits to Gradle and CodeNarc
  updated gitignore with example html/css
moved size-output to page-infobox
Merge branch 'FileCollection'

* FileCollection: (31 commits)
  corrected typo in summary line (blank was missing)
  corrected link in report table
  added trivial utility class to convert filenames containing "bad" link chars to uncritical strings
  all tests green again - can now configure sets of files OR a whole directory tree.
  corrected Set<String> constructors
  removed FileCollection from even more classes... should be completely gone by now
  replaced FileCollection (in configuration) by Set<String> - and avoid hassle with gradle guessing pathnames...
  another Spec for restricted configurations (where only a few of many files shall be checked)
  first working version for multiple files...
  corrected validity-checking, removed damned NPE in checking for empty
  corrected return value
  reordered some statements in build.gradle
  updated readme.adoc
  enhanced Misconfiguration exception
  added a specific Exception type to communicate misconfigurations
  Specification for nested directory structures with scattered html- and non-html files all around
  collectFiles now works recursively - at least in simple cases...
  Specification for illegal or absurd configurations
  FileCollector now handles files in the configured directory
  more faulty configurations specified
  ...

Conflicts:
	src/main/groovy/org/aim42/htmlsanitycheck/report/HtmlReporter.groovy
renamed SummarizerUtil specification /test
method to create nice size representation (three digit with two decimal places)
updated the page-info-table by adding the size (nicely formatted)
styled failed checks in page-details report
back to top now has its own style
back to top link included (at too many places, accidently)
reduced nr of back-to-top-links (one sensible positition still missing)