add Struct
add Process.times
fix wrong call
force tuple into list for rpython
add __deepcopy__ to fix tests
Merge branch 'master' into tim/Struct

Conflicts:
	lib-topaz/array.rb
	spec/tags/core/array/values_at_tags.txt
	topaz.mspec
Merge branch 'tim/Struct' into tim/Process.times

Conflicts:
	topaz/modules/process.py
api change
Merge pull request #670 from topazproject/tim/Struct

Add Struct class
Merge pull request #671 from topazproject/tim/Process.times

Add Process.times
Implemented String#slice_i
removed whitespace
Removed blank line
Removed some slice tags
Attached check_frozen decorator to String#slice_i
Added some more tests
Merge pull request #819 from merryman/master

Implemented String#slice_i