Add support for opening classes.dex file from zip, jar, apk

Adding new ZipArchive class and test

	src/zip_archive.h
	src/zip_archive.cc
	src/zip_archive_test.cc
	build/Android.common.mk

Change from host only use of build dex file for libcore to using host
and target core.jar containing classes.dex files. This requires
setting up an ANDROID_DATA directory to containing an art-cache file
for the extracted dex files, similar to the dalvik-cache for odex
files. A unique ANDROID_DATA and art-cache is created and cleaned up
for each test run (similar to vogar).

	src/common_test.h

Add dependency for libcore jar files to test targets to support
RuntimeTest use of core.jar

	Android.mk

Extract common includes to ART_C_INCLUDES when adding zlib dependency

	build/Android.common.mk
	build/Android.libart.mk
	build/Android.test.mk

Adding TODO regarding unordered map for ClassLinker::classes_ table.

	src/class_linker.h

Adding DexFile::OpenZip (also changed OpenFile to take
	src/dex_file.cc
	src/dex_file.h

Adding kPageSize of 4096, validated by Runtime::Init

	src/globals.h
	src/runtime.cc

    Updated to use kPageSize where it seemed appropriate.

	src/jni_compiler.cc
	src/jni_compiler_test.cc
	src/space.cc
	src/thread.cc
	src/thread_x86.cc

Changed thread_list_ and class_linker_ to be declared in Runtime::Init
initialization order.

	src/runtime.h

Change-Id: Id626abe5b6c1990e4f93598256ee0fae000818f6
diff --git a/src/thread_x86.cc b/src/thread_x86.cc
index d0a4469..0e7cd7d 100644
--- a/src/thread_x86.cc
+++ b/src/thread_x86.cc
@@ -19,7 +19,7 @@
   struct user_desc ldt_entry;
   ldt_entry.entry_number = -1;
   ldt_entry.base_addr = (unsigned int)this;
-  ldt_entry.limit = 4096;
+  ldt_entry.limit = kPageSize;
   ldt_entry.seg_32bit = 1;
   ldt_entry.contents = MODIFY_LDT_CONTENTS_DATA;
   ldt_entry.read_exec_only = 0;