v1.1.alpha15

• Closed GH-320: Now compiles fine with Batteries 2.
• Closed GH-327: Ignore sequences that aren't in both jplace and sequence files.
• Closed GH-312: An improved script for managing classification results, called classif_table.py; classif_rect.py is now deprecated.
• Closed GH-315: support rppr info on reference packages lacking a taxonomy
• Closed GH-316: pplacer warns rather than fails when an alignment looks like nucleotides
• Closed GH-317: pplacer --write-masked-out respects --out-dir
• Closed GH-318: Apply alignment mask on a per-placement basis
• Closed GH-319: pplacer --write-pre-masked no longer exits after writing mask.
• Closed GH-322: Moved to Batteries version 2.1.0. Supports OCaml 4.01.0
• Closed GH-323: pplacer, guppy, and rppr support gzip-compressed alignment and .jplace files.
• Closed GH-324: deduplicate_sequences.py supports gzip-compressed FASTA files.