Add spellchecker script

[JIghtuse]

This patches add spellchecker script and integrates it into CI. See README.txt and comments in the beginning of a script for usage details.

Fixes #118

[carols10cents]

So I'm trying this out, and I think I'm confused or doing something wrong :(

I decided to update the dictionary to get the latest valid words we use that are not spelling errors. So I removed the current dictionary (rm dictionary.txt), then ran the spellchecker script so that it would generate a new dictionary (./spellcheck.sh).

Then i did a git diff to see the changes to dictionary.txt-- mine had all the capitalized words sorted first :-/ I tried changing sort -u to sort -uf, but this removed a bunch of words since it collapses the uppercase and lowercase versions together, so for example it removed "BitAnd" whereas your file contains both "bitand" and "BitAnd". Did you happen to generate dictionary.txt with something other than the command in spellcheck.sh by any chance? I'd like to be able to consistently reproduce dictionary.txt so that diffs are easier to read. I mean, I can just change the file to what I'm seeing, but if it's something that differs per system and a few people run it and we end up changing it back and forth... I'd rather not do that :)

[JIghtuse]

@carols10cents IIRC I used the same script. But it is possible that I added some words and forgot to sort it after that. I'll try to regenerate it now.

[JIghtuse]

@carols10cents strange, it generates almost the same file for me. The only issue I spotted is that I removed sort words (length <= 3) from dictionary, but forgot to remove them from dictionary generator. Fixing it now.

Maybe, we have some weirdly differents sorts? It would be strange, but what else can be wrong. Here is mine:

    sort --version
    sort (GNU coreutils) 8.25

[JIghtuse]

Short words should not appear in dictionary now.

You described perfectly valid assumptions, I agree that it should work like this. And it works for me. We should investigate how it behaves on different machines. I am on Fedora 25 now, and it is fine with sort here (8.25). Tried it in Debian Jessie VM - works too (sort 8.23).

[carols10cents]

Oh geez. It looks like an LC_COLLATE/locale issue after some investigation. And OSX and/or OSX's sort and/or OSX's collation doesn't do the same thing as on linux :-/

I'm going to need a bit more time to investigate my options for fixing this, but at this point it seems like it's going to be a solution on my end, not yours. I'm just going to leave this open for a little bit to see if I have a way I can reproduce the dictionary. If I can't figure something out in a few days, I'll merge and deal.

[carols10cents]

I decided I don't feel like figuring out LC_COLLATE; I just won't use aspell's interactive dictionary adding; nor will I regenerate dictionary.txt from scratch. I want this too much :)

Thank you so much for your work on this, you're going to save us from so many embarrassing typos and misspellings!!!!! ❤️ ❤️ ❤️ ❤️ ❤️

[JIghtuse]

@carols10cents Yay, glad to hear that! Feel free to cc me if you will have any problems/suggestions for this spellchecker.