Better schedule, including plotting

• plot_schedule method that plots the schedule
• forward_slack and backward_slack
• Execution times supported
• Slightly different graph_id that more often do not change the previous
• scipy is now a dependency for drawing splines

Close #35 (closed)

added Scheduling label

changed the description

added 1 commit

• 8d29a826 - Added inline rendering in IPython of schedules

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• 08859e9b - move_operation method added

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• 19ba512a - move_operation method added

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• e92b1a27 - move_operation and slacks methods added

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added 1 commit

• 48c9de2b - move_operation and slacks methods added

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added 7 commits

• 48c9de2b...69cec733 - 6 commits from branch master
• 7f2fa618 - Fixed merge conflict

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• 2c60ea04 - Better rescheduling

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mentioned in commit bdf79a16

merged