Merge pull request #29 from martinghunt/master

Added step at end of improve assembly to filter small contigs
output files to temporary directory
Merge pull request #30 from martinghunt/temp_file_For_filtering

output files to temporary directory
added use file::copy to make move work
Merge pull request #31 from martinghunt/temp_file_For_filtering

added use file::copy to make move work
bug fix - _build_processed_input_assembly() should return the name of a file
Merge pull request #32 from martinghunt/filter_small_contigs

bug fix - _build_processed_input_assembly() should return the name of a ...