Fix #318: fixed datatype error

[Shivanshmundra]

Fix #318: Fixed datatype error
This fixes the issue #318 Don't throw error when some specific parameters value is edited while model is exported. Checked by again importing the same model showing same values of edited parameters.

[coveralls]

Coverage remained the same at 95.442% when pulling 4cb7455 on Shivanshmundra:floatTonumber into 062db16 on Cloud-CV:master.

[utsavgarg]

@Shivanshmundra Thanks for reporting the bug and the fix. But the error seems to persist even after this. Steps to recreate:

• Load ResNet-101 model from the model zoo
• Change value of moving average fraction in the batch norm layer
• Try exporting

[Ram81]

@Shivanshmundra it would be better to parse values at the time of layer update. If you need help with update part we can discuss.

[Shivanshmundra]

@utsavgarg @Ram81 I figured out the error, Actually by default each value is parsed as string.
Now there is exception to parse value as integer but there was no exception for float so I added it and now its working fine.
Have a review.