New external module read-pdf.
Adds functions to:
  - extract text out of PDF documents.
  - render PDF document pages to jpg or png images. document pages to jpg or png images.
Fix documentation in .xq module.
Change simple static library loading to alter java.library.path property at runtime, based on the relative module path.
Added Config.java.in. 
Make use of build time vars for relative dir and lib name.
Adding missing file.
Renamed options elements and functions to dash names.
Fixed compile warning.
Removed comments from schema.
Fix doc sample.
Simplify code.
1. Fix doc comment.
2. Avoid base64 encoding of output images.
3. Introduced startPageSeparator and endPageSeparator to delimit text from pages.
4. Make error message clear in case of bad PDF document.from
Lower version to 0.9 for beta release.
Fix xquery function name caseing.
Add copyright and licese msg to all files, updated copyright year.
Fixed xq documentation.
Merge chris' commit.
Use ZORBA_FIND_JAR instead of FIND_FILE.
Adding tests for extract-text and render-to-images functions.
Avoid versioning bug by moving to 1.0.
Fix exaples path in the doc.
Adding jempbox and common-logging as read-pdf dependencies.
Reworked tests to avoid exact compare. Images are dependent of the fonts installed, text can be splited in diffrent ways.
Move DLLEXPORT in front to acomodate VisualC++ compiller.
Add quotes arround Windows classpath
Fix path separators in CMakeList for Win32.
Fixes for Ubuntu Packages.
Fixes for Ubuntu Packages. Approved: Juan Zacarias, Chris Hillery
Removed unnecessary #include.