Clean up svn:ignore property and .gitignore in dart, dart/pkg, and dart/runtime.

dart/compiler/.gitignore

Index: dart/compiler/.gitignore
===================================================================
--- dart/compiler/.gitignore	(revision 15379)
+++ dart/compiler/.gitignore	(working copy)
@@ -1,32 +1,39 @@
-/domlib_sources.gypi
-/test_sources.xml
-/compiler_corelib_sources.gypi
-/dummy.target.mk
-/dartc.target.mk
-/dart_analyzer.target.mk
-/test_sources.gypi
-/sources.gypi
-/jsonlib_sources.xml
-/domlib_sources.xml
 /compiler
-/Makefile
-/corelib_sources.xml
-/sources.xml
 /third_party
+/compiler_corelib_sources.gypi
+/compiler_corelib_sources.xml
 /corelib_sources.gypi
+/corelib_sources.xml
+/domlib_sources.gypi
+/domlib_sources.xml
+/htmllib_sources.gypi
 /htmllib_sources.xml
-/htmllib_sources.gypi
+/isolatelib_sources.gypi
+/isolatelib_sources.xml
 /jsonlib_sources.gypi
-/compiler_corelib_sources.xml
-/dart-compiler.Makefile
-/dart-compiler.xcodeproj
+/jsonlib_sources.xml
+/sources.gypi
+/sources.xml
+/test_sources.gypi
+/test_sources.xml
 /out
 /xcodebuild
-/isolatelib_sources.xml
-/isolatelib_sources.gypi
-/Release_ia32
-/Debug_ia32
+/Debug
+/DebugARM
+/DebugIA32
+/DebugSIMARM
+/DebugX64
+/Release
+/ReleaseARM
+/ReleaseIA32
+/ReleaseSIMARM
+/ReleaseX64
+/Makefile
+/*.Makefile
+/*.sln
+/*.target.mk
 /*.vcproj
 /*.vcxproj
 /*.vcxproj.filters
 /*.vcxproj.user
+/*.xcodeproj