Fixed typo in condition exposure section of README

`if` should be `if:`
Merge pull request #74 from ujjwalt/patch-1

Fixed typo in condition exposure section of README
Fix for rspec 3 compatability

- be_true/ be_false are no longer equivalent to "== true"/"==
  false" within rspec 3.0.
Add benchmark for serialization
Improve performance by caching entity exposures

- Prevent constant rebuilding of Entity's @exposures class instance variable,
  improving serialization performance by 25%.
Cache Entity @nested_exposures

- Was being rebuilt over and over again. Performance improvement of
  about 25%.
Avoid Kernel.dup when parsing options

- Buys another ~10% of performance gain
Create lookup for attribute names

- Avoid using the to_s, split, last, to_sym chain. Improves performance
  another ~10%.
Clean up code to satisfy RuboCop
Update changelog
Merge pull request #77 from justfalter/fix_for_rspec3

Fix for rspec 3 compatability
Merge pull request #76 from justfalter/improve_performance

Improve performance for serialization of entities
Preparing for release, 0.4.3.
Preparing for next development release, 0.4.4.
Match Grape's build matrix
Merge pull request #79 from greysteil/update-travis

Match Grape's build matrix
Refactored .represent and #delegate_attribute.
Hashes can now be presented.
Added an option to present an collection of objects with a single entity.
Use RSpec 3.x expect syntax.
Preparing for release, 0.4.4.
Preparing for next development release, 0.4.5.