Multiple bugs fixed.

- List URLs of pages that failed to download at the end of the parsing.
- Fix few typos.
- Better exception handling when parsing a post.
Ant build file to create runnable jar.

- Add libraries required for runnable jar creation.
- Add Ant build file with target to create runnable jar.
- Update gitignore to allow including bin/blogparser.jar.
Remove "clean" and "cleanall" targets from Ant build file.

- There is no need for them now.
Add runnable jar of latest blogparser version.