simplify and fix Travis

simplify clone, add Pkg.build("Sundials")
add juliareleases to Travis matrix
juliareleases doesn't have Pkg.test
Fix printing output of ida test in runtests.jl
Merge pull request #20 from tkelman/patch-1

Simplify and fix Travis (#18).
Merge pull request #22 from acroy/runtests2

Fix output of ida test in runtests.jl
Make nvlength return Int

Fixes the following error on 32-bit systems:

ERROR: no method pointer_to_array(Ptr{Float64},(Int64,))

when calling Sundials.asarray
Merge pull request #28 from ignamv/squash

Make nvlength return Int
Create appveyor.yml
use unpacked_dir option in BinDeps

This accommodates having both 32 and 64 bit package installations on the same machine.
Merge pull request #21 from tkelman/patch-2

Create appveyor.yml, use unpacked_dir option in BinDeps
Checking how the appveyor badge looks in README
run appveyor on all branches
add mac travis setup
add flag for enabling sensitivities

default to on for now
go back to testing linux on travis
Merge pull request #30 from JuliaLang/travis-mac

fix #25 and set up future Mac testing on Travis
Update Readme.md to mention the new flag `enable_sensitivities`.
change link to the ANL ftp server

addresses issue #34 using the solution suggested by @acroy
Merge pull request #35 from njwilson23/deps-from-anl

change link to the ANL ftp server