QWERTY keyboard string length [duplicate]

QWERTY keyboard distance (QKD) is, in short, the distance between two letters/numbers/punctuation keys on a standard QWERTY keyboard (if you don't have one around, you can check this Wikipedia picture). Note that only characters without modifiers be considered for this challenge (so ; is valid, but ) is not).

Some examples:

>> QKD("a","s")
1
>> QKD("e","f")
2
>> QKD("g",".")
5


In this code-golf challenge you will have to compute the QWERTY string length (QSL), which is the sum of the QWERTY keyboard distances between every two consecutive characters of a given string. E.g. QSL("abcd") = QKD("a", "b") + QKD("b", "c") + QKD("c", "d")

Examples:

>> QSL("code-golf")
37 // QKD(c,o) + QKD(o,d) + QKD(d,e) + .. = 6  +  6 + 1 + 8 + 6 + 4 + 1 + 5 = 37
>> QSL("puzzles")
25 // 3 + 6 + 0 + 8 + 7 + 1
>> QSL("stackexchange")
43 // 3 + 4 + 3 + 5 + 6 + 2 + 1 + 3 + 5 + 6 + 2 + 3


Some notes:

• You have to support at least a-z, 0-9, =[];'\,./  and Space.
• When you aren't sure about the distance between two characters, refer to the Wikipedia picture.
• Standard loopholes are disallowed, as usual (you knew that, didn't you?).
• This is , thus shortest code wins.
• @TimmyD Hm... looks similar, but the distance metric is different :)` Oct 8, 2015 at 19:44
• This may not be exactly the same, but it is very similar to the duplicate. This question doesn't really add much that the other one doesn't have. Oct 8, 2015 at 19:53
• Ok, no problem... Oct 8, 2015 at 19:54
• You may not have been aware of this, but on Meta there is a Sandbox where you can post challenges that you'd like to post on the main site and get feedback, including any [almost]-duplicates or requests for clarification, perceived problems pointed out, that sort of thing. It really helps to sandbox your challenges first. Oct 8, 2015 at 20:07
• @El'endiaStarman I'm aware of it.... Just didn't think about it before posting :D Oct 9, 2015 at 8:38