comments & readability
working on structures modeule
working on structures module
create structures assembly & components
Merge branch 'master' into dev
working on structures testing:  MassProps done, debugging FEM
still working on structural testing, fix QuadSpar connections
Structural runs, not correctly but it runs
fix up some connections in Structural
make dist
-	Stubbed in Failure component
-	Made Strain a VarTree
-	Split out Strains component from FEM
-	Added matlab test data for Strains  and FEM testing
-	Added test for Strains
-	Got both FEM & Strains tests to pass
-	Integrated structures test still fails and Failure needs to be implemented yet
re-makedir
debugging Structures assembly
use MATLAB data to test mass calculations
add MATLAB data for full up structures calculation
debugging full up structures calculation
fix JointSparProperties and Mass xCG calc...  full-up test now successful
working on Failures component
more work on failures
get Failure component running, working on testing and debugging
final fixes to Failures component & unit test
added failures to full-up Structures Assembly & associated unit test
re-makedist
Merge pull request #2 from swryan/dev

implement structures calculations (mass, FEM, strains, failures)