add tablespace argument to Table

[dantownsend]

Closes #526

[codecov-commenter]

Codecov Report

Merging #527 (18711cc) into master (a89c2fa) will decrease coverage by 0.01%.
The diff coverage is 85.71%.

@@            Coverage Diff             @@
##           master     #527      +/-   ##
==========================================
- Coverage   90.75%   90.74%   -0.02%     
==========================================
  Files         104      104              
  Lines        7010     7020      +10     
==========================================
+ Hits         6362     6370       +8     
- Misses        648      650       +2     

Impacted Files	Coverage Δ
piccolo/apps/migrations/auto/migration_manager.py	94.56% <ø> (ø)
piccolo/apps/migrations/commands/new.py	98.70% <ø> (ø)
piccolo/query/methods/create.py	92.59% <50.00%> (-3.41%)	⬇️
piccolo/query/methods/create_index.py	94.73% <80.00%> (-2.33%)	⬇️
piccolo/apps/migrations/auto/diffable_table.py	90.47% <100.00%> (+0.15%)	⬆️
piccolo/apps/migrations/auto/schema_differ.py	92.51% <100.00%> (+0.16%)	⬆️
piccolo/table.py	95.67% <100.00%> (+0.01%)	⬆️
piccolo/utils/sync.py	100.00% <0.00%> (ø)

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[dantownsend]

This is pretty much done, but need to work out how to run the unit tests on a Postgres database which uses a custom tablespace.