Delete Plattform status again

doc/plattform_status.md

-# Plattform Status
-
-What is the status of mruby on specific plattforms
-
-## Linux
-
-### Ubuntu 12.04
-
-*Works!* This plattform is used by @matz
-
-+ Linux 3.2.0-23-generic #36-Ubuntu x86_64 GNU/Linux
-+ gcc (Ubuntu/Linaro 4.6.3-1ubuntu5) 4.6.3
-
-## Mac OS X
-
-### 10.7
-
-*Works!* This plattform is most of the time working.
-
-+ Darwin 11.3.0 Darwin Kernel Version 11.3.0: 
-  root:xnu-1699.24.23~1/RELEASE_X86_64 x86_64
-+ i686-apple-darwin11-llvm-gcc-4.2 (GCC) 4.2.1 
-  (Based on Apple Inc. build 5658) (LLVM build 2336.9.00)
-
-### 10.8
-
-*Works!*
-
-## Windows
-
-### Windows 7
-