D-12/SEG-1

v-1.0
---
1. admin => change table structure

    ==> done
D-12

v-5.1
---
1. colorize => optionize
    ==> name --> "colorize" >> 1 -> true, 2 -> false

    ==> done
D-12

v-5.2
---
1. open_article => colorize

    ==> done
D-13(D-12)

v-1.0
---
1. tokenize

    ==> done
D-13

v-1.1
---
1. new table => tokens_skimmed
2. validate => unique --> multi-columns

    ==> done