imagesize 0.13.0

Quick probing of image dimensions without loading the entire file.
Documentation
language: rust
rust:
  - stable
  - beta
  - nightly
os:
  - linux
  - osx
cache:
  cargo: true
  timeout: 900
before_cache:
  # Travis can't cache files that are not readable by "others"
  - chmod -R a+r $HOME/.cargo
matrix:
  allow_failures:
    - nightly
script:
  - cargo build
  - cargo test