add Float#floor and Float#ceil
forgotten self
fix Object#inspect, this is supposed to call #to_s
untag float specs that now pass
this spec also passes as a result of this patch
Merge pull request #463 from topazproject/tim/fix-Object#inspect

fix Object#inspect, this is supposed to call #to_s
Merge pull request #464 from topazproject/tim/untag-Float#to_s

untag float to_s specs that now pass
Merge pull request #465 from topazproject/tim/Float#floor-and-#ceil

Float#floor and #ceil
small nits
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