rename headers_test.rb to sections_test.rb

The proper term for headers in AsciiDoc is sections. Update the test
file to reflect that naming convention.
change iconstype to icontype, reads better
resolves issue #125, clean CRLF from endlines
move line cleaning to top of block
strip outer blank lines on document (for valid XML)
add arrow replacements, fix em replacement
Merge pull request #128 from mojavelinux/replacements

Add arrow replacements, fix em replacement
Merge pull request #126 from mojavelinux/clean-crlf

Resolve issue #125, clean CRLF from end of lines
Merge pull request #117 from mojavelinux/rename_headers_test_file

rename headers_test.rb to sections_test.rb
Merge pull request #121 from mojavelinux/iconstype-to-icontype

Change iconstype to icontype