relax non-geo gem constraints

rgeoserver.gemspec

@@ -17,20 +17,20 @@ Gem::Specification.new do |s|
   s.executables   = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
   s.require_paths = ['lib']
 
-  s.add_dependency 'activemodel', '~> 3.2'
-  s.add_dependency 'activesupport', '~> 3.2'
-  s.add_dependency 'confstruct', '~> 0.2'
-  s.add_dependency 'nokogiri', '~> 1.6'
-  s.add_dependency 'rest-client', '~> 1.6'
-  s.add_dependency 'rgeo', '~> 0.3.20'
-  s.add_dependency 'rgeo-shapefile', '~> 0.2'
-  s.add_dependency 'rubyzip', '~> 0.9'
+  s.add_dependency 'activemodel'
+  s.add_dependency 'activesupport'
+  s.add_dependency 'confstruct', '~> 0.2.7'
+  s.add_dependency 'nokogiri'
+  s.add_dependency 'rest-client'
+  s.add_dependency 'rgeo', '~> 0.5.3'
+  s.add_dependency 'rgeo-shapefile', '~> 0.4.1'
+  s.add_dependency 'rubyzip'
 
   s.add_development_dependency 'bundler'
   s.add_development_dependency 'equivalent-xml'
   s.add_development_dependency 'jettywrapper'
   s.add_development_dependency 'pry'
-  s.add_development_dependency 'rake', '~> 10.0'
+  s.add_development_dependency 'rake'
   s.add_development_dependency 'rspec'
   s.add_development_dependency 'version_bumper'
   s.add_development_dependency 'yard'