Simplify some regular expressions

* /\w/ including /\d/
* /\s/ including [/\r/, /\t/, /\n/]
Squash warning in defline.rb: assigned but unused variable - idtype
Squash warning in alignment.rb: assigned but unused variable - lines
Squash warning in alignment.rb: assigned but unused variable - oldkeys
.travis.yml: rbx-18mode is moved to allow_failures