<commit_before>Strip strange characters from Paperclip upload

I modified [wspruijt's version](https://github.com/wspruijt/paperclip-strip-strange-characters) because I didn't like the notification messages I was getting about iconv being deprecated. So I removed all references to iconv in this version. wspruijt did all of the work of actually converting references to `iconv` to references to `gsub`.<commit_msg>props<commit_after>Strip strange characters from Paperclip upload

I modified [wspruijt's version](https://github.com/wspruijt/paperclip-strip-strange-characters) because I didn't like the notification messages I was getting about iconv being deprecated. So I removed all references to iconv in this version. I also changed wspruijt's version to use String.encode per [this stackoverflow](http://stackoverflow.com/questions/7870636/equivalent-of-iconv-convutf-8-ignore-in-ruby-1-9-x/7870859#7870859).
{'fraction_non_alphanumeric': 0.07759562841530054, 'fraction_numerical': 0.02622950819672131, 'mean_word_length': 5.735294117647059, 'pattern_counts': {'":': 0, '<': 3, '<?xml version=': 0, '>': 3, 'https://': 2, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
{'dir': 'git-commits-cleaned', 'id': '5719204', 'n_tokens_mistral': 274, 'n_tokens_neox': 252, 'n_words': 94}