Lower Profile Changes to make Crate and Examples build with Rust 1.44

[sirhcel]

#109 switches to another STM32F3 HAL to solve the current issues when building with Rust 1.44. These are breaking changes delaying the integration.

What about some smaller dependecy updates and hot fixing the deprecation warnings for getting the great examples from this create up and running again as a minor update? This would also solve #110.

I did not update the crate version and would leave this up to you @japaric.