Support alternate impls that throw VM.Pause or VM.Yield
Test Class.forName with null string
Implement a helper similar to Override.create for natives; port some natives to use Native.create. Fixes #378.
Support returning doubles from alternate impls
Convert other natives to Native.create
Port midp/codec.js natives to Native.create
Port midp/crypto.js natives to Native.create
Port midp/frameanimator.js to Native.create
Misc porting of natives to Native.create
Update number of passing tests
Port some gfx natives to Native.create
Merge branch 'native_simple_override_simple' into introduce_native_create
Merge branch 'master' of https://github.com/andreasgal/j2me.js into introduce_native_create

Conflicts:
	native.js
Port other midp/gfx.js natives to Native.create
Port midp/localmsg.js natives to Native.create
Port some midp/midp.js natives to Native.create
Return boolean values in two functions that are supposed to return boolean values
Keep the same indentation as the rest of the file
Merge pull request #446 from marco-c/introduce_native_create

Introduce Native.create
Merge branch 'master' of https://github.com/andreasgal/j2me.js into jitjit