Revert "WIP. Start working on parser."

This reverts commit 8ce24121442752f63f47063305102babb2e4c780.
Merge branch 'dev'

Conflicts:
	src/parser.c
Merge branch 'dev'

Conflicts:
	src/parser.c
WIP. Trying to add expressions to code generator.
Add expressions to code generator and add test cases for them.