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

improved add_header script: fix default skip regexp, only patch .py/.sh files that don't start with '.', skip directories that start with '.' (refs #122)

improved add_header script: fix default skip regexp, only patch .py/.sh files that don't start with '.', skip directories that start with '.'