Undo Gem Version Mod & add style changes per @Fryguy

1. Gem version will be changed when we release.  Back out
the change to version.rb
2. Remove jruby & rubinius 1.8 statements from .travis.yml
3. Undo attempts to fix Rubocop "void context" warnings which
result in redundant code in tests.
4. Simplify validate_definition_entry_modifier & rename to
valid_definition_entry_modifier? since it doesn't raise an exception
5. Simplify get_size
6. Align assignments in constant definitions when possible.
7. Remove unnecessary "()" in new lambda syntax.