modify .gitignore file

.gitignore

@@ -1,42 +1,14 @@
-# rcov generated
 coverage
-
-# rdoc generated
 rdoc
-
-# yard generated
 doc
 .yardoc
-
-# bundler
 .bundle
-
-# jeweler generated
+Gemfile.lock
 pkg
-
-# Have editor/IDE/OS specific files you need to ignore? Consider using a global gitignore: 
-#
-# * Create a file at ~/.gitignore
-# * Include files you want ignored
-# * Run: git config --global core.excludesfile ~/.gitignore
-#
-# After doing this, these files will be ignored in all your git projects,
-# saving you from having to 'pollute' every project you touch with them
-#
-# Not sure what to needs to be ignored for particular editors/OSes? Here's some ideas to get you started. (Remember, remove the leading # of the line)
-#
-# For MacOS:
-#
-#.DS_Store
-#
-# For TextMate
-#*.tmproj
-#tmtags
-#
-# For emacs:
-#*~
-#\#*
-#.\#*
-#
-# For vim:
-#*.swp
+.DS_Store
+*.tmproj
+tmtags
+*~
+\#*
+.\#*
+*.swp