Add direct dependencies

[jpmckinney]

• build: Add all direct dependencies to setup.py, closes #414
• chore: Remove script.py, which is an old entry point
• chore: Don't use relative imports

[codecov[bot]]

Codecov Report

Merging #443 (49e0896) into master (35b136a) will increase coverage by 2.16%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #443      +/-   ##
==========================================
+ Coverage   80.36%   82.52%   +2.16%     
==========================================
  Files          23       22       -1     
  Lines        1044     1013      -31     
==========================================
- Hits          839      836       -3     
+ Misses        205      177      -28     

Flag	Coverage Δ
unittests	82.52% <100.00%> (+2.16%)	:arrow_up:

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Impacted Files	Coverage Δ
setup.py	0.00% <ø> (ø)
scrapyd/app.py	91.22% <100.00%> (ø)
scrapyd/eggstorage.py	100.00% <100.00%> (ø)
scrapyd/environ.py	82.22% <100.00%> (ø)
scrapyd/jobstorage.py	97.82% <100.00%> (ø)
scrapyd/launcher.py	44.87% <100.00%> (ø)
scrapyd/poller.py	96.66% <100.00%> (ø)
scrapyd/scheduler.py	100.00% <100.00%> (ø)
scrapyd/sqlite.py	91.24% <100.00%> (ø)
scrapyd/utils.py	88.23% <100.00%> (ø)
... and 2 more

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