add .travis.yml (not working) for travis ci
Merge branch 'develop' of https://github.com/stan-dev/rstan into develop
implement hessian optim for optimizing()
implement method option in stan_demo()
modify obtaining hessian of optim and add an example
use BFGS in testoptim2.R
Merge pull request #28 from stan-dev/hessian

Hessian, branch hessian2 merged into this branch.
correct current version numbers in CITATION
Merge branch 'develop' of https://github.com/stan-dev/rstan into develop
pushing change to .travis.yml to kick off build
removing .travis.yml temporarily
adding back the .travis.yml
adding email notification address
remove some eigen/unsupported that are not needed
add a BUILD_OPTS to allow more control on travis
Merge branch 'develop' of https://github.com/stan-dev/rstan into develop
add install R and build rstan to travis.yml
comment out email notification recipient
add more to Rbuildignore
update stan submodule