Android patch 20140623

Things to improve in later versions (or now if someone knows a better way):
  * wchar conversion
  * Hack detection
  * Better way to replace builtin formspecs, maybe add Lua API functions
  * Other things you find in there ;-)

### Building

#### Debug:
```
cd build/android
make
<Answer questions>
```
#### Release:
```
<prepare keystore>
cd build/android
make release
<Answer questions>
<enter password when prompted>
```
Can you be more precise what you think not to be required to be phony?
Libraries for example have to be phony because they all have their own build system thus changes there wouldn't be detected at all. To avoid permanent rebuild I added a timestamp mechanism.