Fix problem with plot_semivariogram.py

This is a quick fix for the fact that plot_semivariogram.py would fail
when the inputed mapping file contains more categories than the ones in
the distance matrix.

Fixes #1378
Addressing comments
Addressing comments
Create split_libraries_lea_seq.py
Update split_libraries_lea_seq.py
Create split_libraries_lea_seqn.py

Implements Low-Error Amplicon Sequencing (LEA-Seq) method, described in: Faith, Jeremiah J., et al. "The long-term stability of the human gut microbiota." Science 341.6141 (2013).
Delete split_libraries_lea_seq.py
Rename split_libraries_lea_seqn.py to split_libraries_lea_seq.py
Create split_libraries_lea_seq.py

Implements Low-Error Amplicon Sequencing (LEA-Seq) method, described in: Faith, Jeremiah J., et al. "The long-term stability of the human gut microbiota." Science 341.6141 (2013).
Update split_libraries_lea_seq.py
Merge branch 'master' of https://github.com/qiime/qiime into join_pair_one_file
Update split_libraries_lea_seq.py
Update split_libraries_lea_seq.py
Update split_libraries_lea_seq.py
Create map.txt
Create fwd_read.fq
Create rev_read.fq
Update split_libraries_lea_seq.py
Update split_libraries_lea_seq.py
Create test_split_libraries_lea_seq.py