Correct usage of maven-tools under JRuby 10.0.3+

Added bigdecimal as a runtime dependency due to virtus EOL, and transitive dependency requirement.

See jruby/warbler#607 for addition info.

Author: chadlwilson

maven-tools.gemspec

@@ -29,6 +29,7 @@ Gem::Specification.new do |s|
   s.test_files += Dir['spec/**/*gem']
 
   s.add_runtime_dependency 'virtus', '~> 1.0'
+  s.add_runtime_dependency 'bigdecimal' # virtus is EOL, but depends on axiom-types which has a bigdecimal dependency
 
 # get them out from here until jruby-maven-plugin installs test gems somewhere else then runtime gems