Removes numpy dependency

[nirum]

As pointed out in issue #8, requiring numpy as a dependency is unnecessary for such a lightweight utility.

This PR replaces the two places where numpy was used:

• Switches from np.floor to math.floor when rounding, and
• Converts a pandas DataFrame to a numpy array using a class method (as opposed to a numpy function)

[pep8speaks]

Hello @nirum! Thanks for submitting the PR.

• In the file setup.py, following are the PEP8 issues :

Line 6:80: E501 line too long (85 > 79 characters) Line 22:80: E501 line too long (82 > 79 characters) Line 23:80: E501 line too long (89 > 79 characters) Line 56:80: E501 line too long (80 > 79 characters) Line 62:80: E501 line too long (82 > 79 characters)

• In the file tableprint/printer.py, following are the PEP8 issues :

Line 23:80: E501 line too long (101 > 79 characters) Line 31:80: E501 line too long (87 > 79 characters) Line 37:80: E501 line too long (81 > 79 characters) Line 73:80: E501 line too long (89 > 79 characters) Line 82:80: E501 line too long (93 > 79 characters) Line 94:80: E501 line too long (90 > 79 characters) Line 139:80: E501 line too long (97 > 79 characters) Line 158:80: E501 line too long (98 > 79 characters) Line 164:80: E501 line too long (94 > 79 characters) Line 177:80: E501 line too long (83 > 79 characters) Line 196:80: E501 line too long (93 > 79 characters) Line 217:80: E501 line too long (83 > 79 characters) Line 226:80: E501 line too long (82 > 79 characters)

• In the file tableprint/utils.py, following are the PEP8 issues :

Line 34:80: E501 line too long (85 > 79 characters)

• In the file tests/test_io.py, following are the PEP8 issues :

Line 14:80: E501 line too long (196 > 79 characters) Line 21:80: E501 line too long (196 > 79 characters) Line 25:80: E501 line too long (109 > 79 characters) Line 30:31: E231 missing whitespace after ',' Line 30:42: E231 missing whitespace after ',' Line 30:53: E231 missing whitespace after ',' Line 33:80: E501 line too long (124 > 79 characters)

[codecov-io]

Codecov Report

Merging #9 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master     #9   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           5      5           
  Lines         135    134    -1     
=====================================
- Hits          135    134    -1

Impacted Files	Coverage Δ
tableprint/printer.py	100% <100%> (ø)	:arrow_up:
tableprint/utils.py	100% <100%> (ø)	:arrow_up:
tableprint/metadata.py	100% <100%> (ø)	:arrow_up:

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