Replace all words at one time.

[leafOfTree]

As #78 mentioned, words with any chars in '<mark style="background-color:'+ color +';">' + encodedMatch + '</mark>' elements could cause wrong replacement if replacing word one by one.

To fix this. all words are joined as one regexp to replace text at one time.

Ex:

words: [
  {
    color: '#ADF0FF',
    words: ['abc']
  },
  {
    color: 'blue',
    words: ['-']
  }
],