Merge pull request #5 from mklauser/pr136

Pr136
problem with power_law test
added spectrum section
added a number of tests for paper1
Merge branch 'config/adding_tests' into config/using_definition_parser
added further tests
Merge branch 'config/adding_tests' into config/using_definition_parser

Conflicts:
	tardis/io/tests/test_config_reader.py
changed the densities test
Merge branch 'config/adding_tests' into config/using_definition_parser
branch85_w7
getting the w7 parser to work
ident fix