ver 1.2
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Support many periods: 2^{607}, 2^{1279}, 2^{2281}, 2^{4253}, 2^{11213},
2^{19937}, 2^{44497}, 2^{86243}, 2^{132049}
Fix typo in LICENSE.txt.
Add cast to vec_perm for SFMT-alti.c, SFMT-alti64.c.
combine source codes.

ver 1.1
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The period certification method is changed from constant to function.
The convert functions from 32-bit and 64-bit integer to double are added.
The documentation is changed.
Sample programs are added.

ver 1.0
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The first version.