revert part of previous commit that put all imports on the top, because it creates a cyclic dependency between build_log and config (config imports from build_log, build_log imports from config)

move all imports to the top, because it seems sometimes an import may fail if it's put 'inline' (see ageorges testing EasyBuild v0.5 on Ubuntu)

don't specify shell to use for modulecmd commands, it breaks stuff (" Usage is '/usr/bin/modulecmd shellname' ")

i.e. use /bin/bash as shell for root script (refs #180)

specify /bin/bash as executable for running system commands (required for Ubuntu), check if environment-modules is installed (refs #180)

specify "/bin/bash" as executable for running system commands, make sure that environment-modules dependency is installed

bunch of fixes to enable robot to perform quick demo (i.e. build HPL with goalf toolkit, from scratch) (refs #249)

also prepare for toolkit itself, if there a preparation function available

extend MODULEPATH with <installPath>/modules/all to make sure that EasyBuild is able to resolve it's dependencies (refs #250)

extend subdir paths in which robot tries to find specification files, check if expected module is obtained when processing a .eb spec file match, make sure that resolveDependencies doesn't get stuck in an infinite loop (by adding a loop counter and a max loop count)

add sourceURLs to all example .eb spec files, and make sure naming scheme is OK for robot to find the files

try and create build/install/source paths if they don't exist already (refs #217)

try and create build/install/source paths if they don't exist already (refs #217)

give command line config file preference over enviroment variable EASYBUILDCONFIG, minor tweaks to default config and error reporting (refs #217)