adding first working resource - rspec
also moving task dir to tasks
added mixlib-shellout & rspec to list of deps
task: automatically call execute after instance_eval'ing
SingularityDsl: refactoring & renaming functions, updated tests
rspec: add description & Task::validate_file checks
"properly" getting descriptions
skeleton shell_task
[refactor]: adding singularity_script util fx
[feature] rake task
[feature] rubocop task
[patch] bootstrap rake & rubocop tasks, update CI script
[patch] rubocop fixes
Merge pull request #3 from behance/rspec-resource

First working example