Remove some unneded comments

Same content already exists in README.md
Unit tests + ast.Or

Impelement unit tests for module 'regex'
Implement ast.Or
Remove unneeded comments (mostly commented out code)
Also add make target for debugging
Add unittests for regex parser

Do comparisons with ASTs string representations
Refactor subParse() and its module

change "if else" into "switch"
add "private" qualifiers to private functions of the module
rename some variables
Improve unitests regex.d/parser.d

Remove unneded import of std.stdio;
Add unit tests that capture current behaviour (which actualy should be fixed/improved)
Remove commented out code testcode
Nonfunctional imoprovements

Rename subParse()->recursiveParse()
Rename its argument ix->currentChar
Add comment on the function
Fix alteration's precedence

Alteration should have lower precedence then sequence (previously was vice versa)
Improve unittest error message