Revert "adding tests for error formatting of errors class"

This reverts commit 47fbaf67a7afa98ec35a324be04366fffca11882.
Revert "Don't print array literals in error messages"

This reverts commit 4f8b874e3e86425eaaba606f9152f03acdd4da38.
Replace before(:all) hooks with before(:each) in unit tests

Signed-off-by: Maria Shaldibina <mariash@pivotallabs.com>
reverting error message related commits which broke build

investigating further

Merge branch 'check_if_revert_fixes_stacks_error'