Refactoring Corporations Markdown
Began adding markets
Merge branch 'v2' of https://github.com/Neamar/corporate into market
Refactored Corporations Markdown + Test City Corporation Markdown
Added creation of Corporation's Market
Added Market, refactored CorporationMarket
Added historic markets
Optimized construction of Market objects
Small refactoring of code
PEP8
Small optimization
corporation.update_assets() takes a market as parameter, or default to historic market
Merge branch 'v2' of github.com:Neamar/corporate into market

Conflicts:
	engine_modules/speculation/tests/test_orders.py
Testing for update_assets()
Optimization
Renamed market to markets in markdown
Use  instead of dash
Market to markets
Merge pull request #75 from Neamar/market

Adding markets to corporation