remove tests

mrdna/readers/test/1.json

mrdna/readers/test/Na_liu.json

mrdna/readers/test/Untitled.ipynb

mrdna/readers/test/ipykernel_launcher.json

mrdna/readers/test/libs

mrdna/readers/test/loopout.csv

mrdna/readers/test/loopout.sc

mrdna/readers/test/rest_scaf_col.json

mrdna/readers/test/s.csv

mrdna/readers/test/sc.csv

mrdna/readers/test/segmentmodel_from_cadnano.bak.py

mrdna/readers/test/seq0.txt

mrdna/readers/test/test.csv

mrdna/readers/test/test.sc

mrdna/readers/test/test.seq.json

mrdna/readers/test/test.virt2nuc

mrdna/readers/test/test2.ipynb

mrdna/readers/test/test3.ipynb

mrdna/readers/test/test_cad2.5.json

mrdna/readers/test/test_insert.json