static allocator

declare alloc as a static data member
Update strvec.cpp
Revert "Update strvec.cpp"

This reverts commit df26d2b52df7b5f312b73561d5ad8a0433ae52b6.
recover wrong revert
Merge pull request #9 from Queequeg92/master

static allocator
Update README.md
Update README.md
change operators of StrBlobPtr

modify operators : == and !=
add operators: > and <
Merge pull request #10 from Queequeg92/master

change operators of StrBlobPtr

Thx for contribution~
test
ex5_10
Merge pull request #11 from codewyh/My-Branche

ex5_10--Thx for contribution~
ex5_23
ex5_24
ex5_25
error in 5_23
ex5_25

just made a mistake
Merge pull request #12 from codewyh/My-Branche

merge ex5_23 to ex5_25, fixing a bug.
Thx for contribution.
Merge pull request #1 from codewyh/My-Branche

My branche
Revert "test"

This reverts commit 505a0ca293045495e6470979470fb406154dfe9c.