Update gitignore templates

* Update patterns for pub
* Add patterns for dart2js
* Add pattern for dartdoc
* Include pattern for pubspec.lock in package-simple library package
only
* Remove IntelliJ specific .idea
* Remove MacOS specific .DS_Store

templates/console-full/.gitignore

+# Files and directories created by pub
 .buildlog
-.DS_Store
-.idea
 .packages
+.project
 .pub/
 build/
-packages
-pubspec.lock
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/

templates/package-simple/.gitignore

+# Files and directories created by pub
 .buildlog
-.DS_Store
-.idea
 .packages
+.project
 .pub/
 build/
-packages
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/
+
+# This is a library package
 pubspec.lock

templates/server-appengine/.gitignore

+# Files and directories created by pub
+.buildlog
 .packages
+.project
 .pub/
-packages
-pubspec.lock
+build/
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/
\ No newline at end of file

templates/server-shelf/.gitignore

+# Files and directories created by pub
 .buildlog
-.DS_Store
-.idea
 .packages
+.project
 .pub/
 build/
-packages
-pubspec.lock
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/

templates/web-polymer/.gitignore

+# Files and directories created by pub
 .buildlog
-.DS_Store
-.idea
 .packages
+.project
 .pub/
 build/
-packages
-pubspec.lock
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/

templates/web-simple/.gitignore

+# Files and directories created by pub
 .buildlog
-.DS_Store
-.idea
 .packages
+.project
 .pub/
 build/
-packages
-pubspec.lock
+**/packages/
+
+# Files created by dart2js
+*.js
+*.precompiled.js
+*.js.deps
+*.js.map
+*.info.json
+
+# Directory created by dartdoc
+doc/