dev-environ: utilize devtool for code modifications

This moves from utilizing the SDK to using devtool in order to make a
"hello world" test. As noted in the prior commit, this is done due to
the co

dev-environ: utilize devtool for code modifications

This moves from utilizing the SDK to using devtool in order to make a
"hello world" test. As noted in the prior commit, this is done due to
the complexity of the SDK environment vs. the more consistent (but
slower) devtool development process.

Change-Id: Iab7b6bbf82a5e36b121c1fedf916f956a35ca8e9
Signed-off-by: Andrew Geissler <geissonator@yahoo.com>

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