Adding test cases for Equivalent RE
Notation fix
Merge pull request #13 from l-sora/master

enhancement:
Removed redundant message. Previous commits from Luis provide a more detailed
message.
Fix test cases RE-NFA and new test cases added
Merge pull request #14 from abalvane/master

Adding test cases for Equivalent RE
Documented instructions on how to build the proyect into a single exe file.
Merge pull request #15 from omar-ocampo/foocampo_dev

Documented instructions on how to build the proyect into a single exe fi...
Detect valid symbols before converting RE from infix to prefix.

Also catch any exception in the GUI and report the message to the user.
Some style fixes and removed duplicated test
Merge pull request #16 from omar-ocampo/foocampo_dev

Some style fixes and removed duplicated test
Fixed bug for empty parenthesis. Added the corresponding test cases.
Added more test cases.
Changed messages from english to spanish
Added support to detect the empty set with character %
adding NFA support for the empty set and a basic test case