check whether blast is in the path on load
In travis, add an empty file named 'blastp' to the PATH, so travis doesn't fail when it can't find blastp
updating the logic behind asserting BLAST installation
validating Mafft installation
updating --mafft help text to represent the changes in previous commit
running blast directly - i.e. without using the full path
running mafft directly and fixing error in blast.rb
editing the logic so that some validation still occur even if mafft isn't found; also removing all mafft_path and blast_path from the logic
update the test files to represent changes in previous commits
update the add_to_path in line documentation
update the test files further to represent changes in previous commits
Merge https://github.com/monicadragan/GeneValidator into check_blast_path

Conflicts:
	bin/genevalidator
	lib/genevalidator/blast.rb
	lib/genevalidator/validation_alignment.rb
	lib/genevalidator/validation_duplication.rb
	lib/validation.rb
	test/test_all_validations.rb
update the blast method documentation
oops, fixing error due to conflict in previous merge
Merge pull request #51 from IsmailM/check_blast_path

check whether blast is in the path on load