derive full easyblock path if it's only specified by name, fix bug and improve error handling (refs #214)

derive full easyblock module path when easyblock is only specified by name, return created instance, better error handling

replace 'mod' in .eb files with 'easyblock'
avoid use of exec in get_instance (see #214)

revert always calling setlogger in __init__ of application, to avoid logging the same things multiple times (refs #7)

revert always calling setlogger in __init__ of application, to avoid logging the same things multiple times (refs #7)

Conflicts (resolved by kehoste):
	easybuild/build.py
	easybuild/framework/application.py

various code cleanups, fix issues in get_instance and make sure logger is created in application.__init__ (refs #7)

 removed deprecated functions

 634 violations instead of 1094

make necessary adjustments to support a build of gzip using a dummy toolkit (i.e. using system compiler):
 * fix raising of errors (refs #125)
 * fix reporting for missing environment-modules (refs #7)
 * fix function names after refactoring in framework.application (refs #125)
 * fix getting Application instance (refs #125)
 * fix default value for toolkit (refs #7)
 * improve logging (and stdout output) (refs #7 refs #57)
 * add default logFormat (so build_log testing works) (refs #7)

make necessary adjustments to support a build of gzip using a dummy toolkit (i.e. using system compiler):
 * fix raising of errors
 * fix reporting for missing environment-modules
 * fix function names after refactoring in framework.application
 * fix getting Application instance
 * fix default value for toolkit
 * improve logging (and stdout output)
 * add default logFormat (so build_log testing works)

remove UTF-8 stuff from tools/class_dumper.py