Move from resetting to hard limits to original limits

[daffidwilde]

• Move to hidden param_limits attribute

• Add _store_limits method and update reset.

• Update docs to new way of doing things (see Move from resetting to hard limits to original limits #92). (Update docs to new way of doing things (see #92). #93)

• Remove deadline from test_run as per convo in Update docs to new way of doing things (see #92). #93

[coveralls]

Pull Request Test Coverage Report for Build 118

• 10 of 10 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 105:	0.0%
Covered Lines:	386
Relevant Lines:	386

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💛 - Coveralls