0.3.4 candidate -- final feature requests

[johnlees]

• [x] Update author list
• [x] Change middle base filter to strict, closes #53
• [x] Add iterator trait #54
• [x] Add a filter to ignore missing sites #51
• [x] Check min-count behaviour #56

[codecov[bot]]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (f240fc5) 92.50% compared to head (deb514e) 92.65%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #61 +/- ## ========================================== + Coverage 92.50% 92.65% +0.14% ========================================== Files 16 16 Lines 2175 2232 +57 ========================================== + Hits 2012 2068 +56 - Misses 163 164 +1 ``` | [Files](https://app.codecov.io/gh/bacpop/ska.rust/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop) | Coverage Δ | | |---|---|---| | [src/generic\_modes.rs](https://app.codecov.io/gh/bacpop/ska.rust/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2dlbmVyaWNfbW9kZXMucnM=) | `100.00% <100.00%> (ø)` | | | [src/lib.rs](https://app.codecov.io/gh/bacpop/ska.rust/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2xpYi5ycw==) | `81.10% <100.00%> (+0.46%)` | :arrow_up: | | [src/merge\_ska\_array.rs](https://app.codecov.io/gh/bacpop/ska.rust/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL21lcmdlX3NrYV9hcnJheS5ycw==) | `99.68% <100.00%> (+0.03%)` | :arrow_up: | | [src/cli.rs](https://app.codecov.io/gh/bacpop/ska.rust/pull/61?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop#diff-c3JjL2NsaS5ycw==) | `73.71% <71.42%> (-0.26%)` | :arrow_down: | ... and [1 file with indirect coverage changes](https://app.codecov.io/gh/bacpop/ska.rust/pull/61/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=bacpop)

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