added BrentRootFinder
RootFinding: move files, namespace, tests, projects
RootFinding: migrate message strings to resources
RootFinding: simplify exception
RootFinding: simplify unit test
RootFinding: cosmetics
RootFinding: extract bracketing to separate class
RootFinding: refactoring, simplify
RootFinding: algorithm cosmetics
Merge brent root finding algorithm
Common NonConvergenceException
Use the new NonConvergenceException in more places, where appropriate
Update Portable project