odds 0.2.5

Odds and ends — collection miscellania. Odds for example provides debug checked variants of `get_unchecked` and `slice_unchecked`, and extra methods for strings and vectors: `repeat`, `insert_str` and `splice`. Things in odds may move to more appropriate crates if we find them.

language: rust
sudo: false
matrix:
  include:
    - rust: stable
    - rust: beta
    - rust: nightly
      env:
      - FEATURES='unstable'
script:
  - |
      cargo build --verbose --features "$FEATURES" &&
      cargo test --verbose --features "$FEATURES" &&
      cargo test --release --verbose --features "$FEATURES" &&
      cargo doc --verbose --features "$FEATURES"