Load the configuration settings based on the task's name without assuming jasmine_node

It's possible to rename the task using `grunt.renametask`, but if the task is renamed then the settings are not loaded correctly.

This is useful if you want to have multiple test suites which load different configs.
Merge pull request #9 from lennym/feature/use-name-for-loading-options

Load the configuration settings based on the task's name without assuming "jasmine_node"