moved vagrant and changed to ubuntu
Also using the new autoconf
fix #91
Merge pull request #93 from kmpm/ubuntu

moved vagrant and changed to ubuntu
update ax_boost_base.m4 from gnu repository. fixes path detection for 64-bit systems, very good.
Merge pull request #94 from iShift/patch-1

fix #91
replace HaveTxIndex for GetTransaction. this is a more secure check since it also
verifies if tx is part of current main chain. old test may cause problems for people
trying to reregister their usernames in case of reversal attack since nodes might incorrectly
refuse to accept/retransmit the new transaction.
another try to fix the infinite recursion triggered when the new (longer) chain
contains an invalid transaction (due to older, buggy, twisterd or attacker).
i'm not entirely convinced that original bitcoin couldn't be attacked the same
way (51% is still needed, but crashing the client is pretty bad).
0.9.7