Whenever you click the ignore XXXX in the context menu, the word XXXX will be added into the ignored_words list.
I had been using Sublime 2 for years and moved to Sublime 3 in 2013. However, ST3's spell check will never remember the words it should ignore. I have googled this problem a lot and seems that the only way to solve this problem is to mannuly add words in the ignored_words list in user settings. Therefore, I made this simple plugin to do the dirty job.
Only ST3 under linux and windows is tested. I hope it will work also for OSX users.