Resolve issues from upstream repository

[crissdev]

trafficstars

Try to merge valid PRs from upstream repository and fix issues.

• [x] Fix SteveSanderson#124 - Use hasOwnProperty to check for bucket existence 1cf041d950529662eca35e50b7acb075c791e14c (PR SteveSanderson#173)
• [x] Put null check first in canHaveProperties 57a0b56c6368bb3b8816fb0d78c35820aa719bf3 (PR SteveSanderson#149)
• [x] Use intermediate vars to decrease minified size f97d5cde145962af919a6472d22418f9f0f43626 (PR SteveSanderson#151)
• [x] Only get types once in mergeArrays e6c56313d22375e0e1ac7242f18dce9811577ad2 (PR SteveSanderson#148)
• [x] Incorrect handling of properties with periods (SteveSanderson#96)
• [x] allow JSON.stringify parameters to be specified to ko.mapping.toJSON 8e55292c826ceadcd5bc52986433d09c8aad73fd (SteveSanderson#205)
• [ ] include option is not working properly (SteveSanderson#176) - to verify
• [x] Mapping doesn't work when properties listed in different order (SteveSanderson#203)

[crissdev]

@tjyrkinen If time permits please take a look at SteveSanderson#176 (see above). It will help a lot in moving forward and getting close to v3.0. Thanks.