* [iOS] layoutEngin Fix text height problem. (#1414)
* [iOS] layoutEngin Fix text height problem. (#1414)

[WEEX-555][iOS] Fix layout engin bug

Fix max-width problem:
* http://dotwe.org/vue/4022e76a68de681d423ea49ae434deff

Fix text layout problem:
* http://dotwe.org/vue/cf3151b4998e8f5c7adda9a85b47d864
* http://dotwe.org/vue/42176496c85d43b2016513588eeb6b10
* http://dotwe.org/vue/55014cc3ada41e048ac0f90c1454096a
* http://dotwe.org/vue/ce6283454398d66ceb0fca068aa704ec



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