fix typo
add $DOWNLOAD_LOC and fixes

- fix missing -L option for curl
- update python version to 2.7.8
bugfix: boolean bash checks
check if local pip exists, before installing it
check pydot version before installing it
check if cvxopt exists, before cloning and installing it
bugfix: syntax for setting CVXOPT env vars
add verbosity
bugfix: add quotes
check for local gr1c binary, instead of gr1c on the path
clone polytope from github and install

to obtain the latest version
style
fix polytope case selection
run tulip fast tests in the end
handle case of missing

because sed cannot append to empty file
comment unnecessary and erroneous line
check dependencies: gcc, gfortran, bison, flex
list potential non-default dependencies on debian-based systems
exit on first error
Merge branch 'ubuntu' of github.com:johnyf/tulip-control into ubuntu