[Gitignore] Don't ignore .hg folders

.gitignore

+# General
 *.swp
 *.swo
 *.rbo
 *.gem
 .DS_Store
 .rbenv-version
+.rbx/
 xcuserdata
 project.xcworkspace
 DerivedData
+/concatenated.*
+
+# Yardoc
+.yardoc
+/doc
+
+# Specs
 tmp
-examples/Podfile
-examples/Pods
-examples/**/Pods
-examples/RelativePathProject/RelativePathProject/RelativePathProject.xcodeproj
 spec/fixtures/banana-lib
 spec/fixtures/chameleon
 spec/fixtures/integration/Headers/
-/concatenated.*
-spec/fixtures/mercurial-repo/.hg/*cache
-.hg
 spec/fixtures/vcr
-.yardoc
-/doc
-.rbx/
+
+# Examples
+examples/Podfile
+examples/Pods
+examples/**/Pods
+examples/RelativePathProject/RelativePathProject/RelativePathProject.xcodeproj