fixed path issue in 'join_paired_end_reads_seqprep' function
re-wrote code in join_paired_end_reads_fastqjoin, updated test code
continued re-weritting of user function to make more QIIME user-friendly
address some of Daniel & Greg's comments
fixed boolean in join_paired_end_reads_seqprep, minor code changes
fixed test case string
fixed more test strings
Merge pull request #56 from mikerobeson/master

fixed path issue in 'join_paired_end_reads_seqprep' function
convenience functions now append / rename files with '.fastq'
Merge pull request #57 from mikerobeson/master

paired-end joining app controllers updated for better QIIME compatibility.