argparse + optional dropping for 'N's
deleted unused lines, made n's lowercased, and fixed pep8 fomatting
adding argument descriptions and tests for scripts/ graduation
new test file with Ns for test_scripts & added test_fastq-to-fasta in test_scripts
Testing optional argument for higher coverage
Merge pull request #426 from ged-lab/fix/fastq-to-fasta_N

added dropping N counts #395
FASTQ-TO-FASTA output now to stderr, refactoring of test script
FASTQ-TO-FASTA output now to stderr, refactoring of test script
improved debugging for test_scripts.py
added testing for exclusion of -o argument in test_scripts.py
Updated ChangeLog
removed fastq-to-fasta from sandbox (moved to scripts)
Merge branch 'fix/fastq-to-fasta_toscripts'

Conflicts:
	sandbox/fastq-to-fasta.py
Revert "Merge branch 'fix/fastq-to-fasta_toscripts'"

This reverts commit 58934fab7c6f989c8e0f58bbc51c6c782d102793, reversing
changes made to a99c777dbe863f0afae8aee927f208df0871b449.
include sweep-reads-buffered in docs