fixed dirpath creation, added/updated some documentation
Merge pull request #64 from Tieske/fix_dir

fixed makepath creation, added/updated some documentation
HTML mode skips DOCTYPE; no globals harmed outside pl.utils
windows environment variable TMP is deprecated, use TEMP
added utils.executeex, which also returns output of stdout and stderr
update: read files in binary mode
mode binary mode optional (binary would require platform specific line endings to be converted which is not very portable, and mostly just text will do)
Merge pull request #66 from Tieske/fix_temp

windows environment variable TMP is deprecated, use TEMP
updated, using readfile now, remove obsolete os.remove commands
Merge pull request #67 from Tieske/add_executeex

added utils.executeex, which also returns output of stdout and stderr
added rockspec, fixed typo in filename
changed .txt to .md files
updated readme to md format