Changes to adapt to Expr changes.
Reorganization and start of Sundials support.
Partially working Sundials solver plus fixed the DASSL solver.
Fix some segfaults.
Convert the dassl solver back to using a global variable.
Tweaks and fixes to the sundials solver.
Keep dasslsim as the default.
Readme updates.
Change ref/assign to getindex/setindex!.
Remove depreciated/removed Base functions.
Type changes for initial values.
Initial equation macro
Update elaboration for initial equations.
Better Unknown display; more improvements to initial calculation setup.
More infrastructure for initialization.
Add require for Julia 0.2
Fix to unary method definitions to reduce the number of embedded MExpr's.
Merge from master
Changes to update to Jeff's final keyword args implementation.