fix under cygwin when using win32 java

- win32 java expects win32 paths, so javacomplete would fail if java is
  compiled for windows
- this fix will convert the unix paths to windows paths when executing
  jre/jdk commands
Merge remote-tracking branch 'itszero/master'

Conflicts:
	autoload/javacomplete.vim
Fix a few bugs found when testing under linux

- missing a: before arg variable
- incorrect usage of System in void context
Add ftplugin to auto enable
Converted README to markdown

- new file is README.md
Merge pull request #1 from james-m-henderson/master

Updates for cygwin