Android support + minor improvements

* Add Android API 21 support (make android) using POSIX / SIGNAL arch
* Add support for targets with args of type arg=___FILE___
* Add .gitignore
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..251171b
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,10 @@
+*.o
+*.so
+honggfuzz
+*.dSYM
+mach_exc.h
+mach_excUser.c
+mach_excServer.h
+mach_excServer.c
+libs
+obj